Backend (CheckoutController):
- Enhanced get_fields() API with custom_attributes, search_endpoint,
search_param, min_chars, input_class, default
- Supports new 'searchable_select' field type for API-backed search
Customer SPA:
- Created DynamicCheckoutField component for all field types
- Checkout fetches fields from /checkout/fields API
- Renders custom fields from PHP filters (billing + shipping)
- searchable_select type with live API search
- Custom field data included in checkout submission
This enables:
- Checkout Field Editor Pro compatibility
- Rajaongkir destination_id via simple code snippet
- Any plugin using woocommerce_checkout_fields filter
Updated RAJAONGKIR_INTEGRATION.md with code snippet approach.
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